expression, noun
hanger-on; clingy follower; tag-along
Idiomatic, mildly derogatory term for someone who follows another person around persistently, like goldfish feces trailing behind. Often used humorously or critically among friends.
See also: 金魚のフン
あいつ、いつも先輩の後ろを金魚のうんこみたいについて回ってるよね。
That guy is always following the senior around like a shadow, isn't he?
彼女は彼氏の金魚のうんこで、どこにでも一緒に行く。
She's her boyfriend's clingy follower and goes everywhere with him.
Synonymous variant using フン instead of うんこ; うんこ is more colloquial and slightly more vulgar.
Implies obsessive, often unwanted following; 金魚のうんこ is lighter and more about being a constant companion rather than a stalker.
From the image of goldfish feces trailing behind the fish; the expression likens a person who constantly follows another to this trailing waste.